Effect of doping on the performance of high-crystalline SrMnO3 perovskite nanofibers as a supercapacitor electrode
Effect of doping on the performance of high-crystalline SrMnO3 perovskite nanofibers as a supercapacitor electrode
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DOI：
10.1016/j.ceramint.2018.08.313
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发表时间：
2018-12-01
影响因子：
5.2
通讯作者：
Luo, Zhiping
中科院分区：
文献类型：
--
作者：
George, Gibin;Jackson, Shanell L.;Luo, Zhiping
钙钛矿氧化物是一种具有较强物理化学性能的多功能材料。在本研究中，以聚乙烯吡咯烷酮为牺牲高分子粘合剂，采用溶胶-凝胶静电纺丝法，在不同温度下煅烧，成功合成了高结晶SrMnO3钙钛矿氧化物纳米纤维。孔隙率和晶粒尺寸随煅烧温度的变化对制备的SrMnO3纳米纤维的电化学性能有很大影响。在700℃下煅烧的SrMnO3纳米纤维电极在放电电流密度为0.5 a g（-1）时的电化学电容为321.7 F g（-1）。研究了Sr掺杂Ba/Ca和Mn掺杂Co/Fe/Ni对SrMnO3纳米纤维比电容的影响。在放电电流密度为0.5 a g（-1）时，负载20 mol% Ba的超级电容器电极的比电容为446.8 F g（-1）。在5000次连续循环后，纳米纤维保持了87%的初始电容。在功率密度为400w kg（-1）时，该电极的能量密度为37.3 W h kg(-1)，在8006 W kg（-1）的高功率密度下，其能量密度仍保持在15.7 W h kg(-1)，表明该电极材料在超级电容器中具有高速充放电操作的潜力。
Perovskite oxides are promising multi-functional materials with enhanced physical and chemical properties. In this study, high-crystalline SrMnO3 perovskite oxide nanofibers have been successfully synthesized by sol-gel electrospinning followed by calcination at different temperatures, using polyvinylpyrrolidone as a sacrificial polymeric binder. The change in porosity and grain size with calcination temperature imparted a substantial effect on the electrochemical properties of the obtained SrMnO3 nanofibers. The SrMnO3 nanofiber electrode calcined at 700 degrees C exhibits an electrochemical capacitance of 321.7 F g(-1) at a discharge current density of 0.5 A g(-1). The effect of doping Ba/Ca on Sr, and Co/Fe/Ni on Mn, respectively, on the specific capacitance of SrMnO3 nanofibers is studied. 20 mol% Ba loading shows the best performance as a supercapacitor electrode with a specific capacitance of 446.8 F g(-1) at a discharge current density of 0.5 A g(-1). The nanofibers retained 87% its initial capacitance after 5000 successive cycles. The device fabricated using the nanofibers show an energy density of 37.3 W h kg(-1) at a power density of 400 W kg(-1), and it is retained as 15.7 W h kg(-1) even at a high-power density of 8006 W kg(-1), indicating the potential of this electrode material for high-rate charge/discharge operations in supercapacitors.